Impact of contact rings in plate and blanket cylinders of printing section’s drive on its dynamic accuracy

Abstract

In drives of printing section of modern web dou-ble-side printing presses, contact steel rings are attached at end of plate and blanket cylinders that press the cylinders against each other on their rotation. The amplitude-frequency response of rotational vibrations of the plate and blanket cylinders, their natural frequencies and shapes of natural vibrations are discussed upon herein. It is found that in a general case the rings reduce an intensity of the vibrations, however, ther impact is not unambiguously positive: the rings reduce relative vibrations between the plate and blanket cylinders, however, they increase the vibrations between the blanket cylinders where a print passes.